get data from a form

Hello,

Yersterday, you gave me this solution to get data from a poll.

<?php
$polls = Forminator_API::get_polls();

foreach ( $polls as $poll ) {
	$chart_data = forminator_get_chart_data( $poll );
}

It works good, but when I try to apply this solution to a form, I have this error :
Fatal error: Uncaught TypeError: Argument 1 passed to forminator_get_chart_data() must be an instance of Forminator_Poll_Form_Model …

Is there an equivalent function to forminator_get_chart_data() for a form ?

Sorry to ask a trivial question but there is no documention about how to extract data from forminator.

thx